<p>A magnetically driven pump device is configured in such a manner that an impeller (12b) is rotated relative to a pump case (11) by a rotating magnetic field applied without contact by a drive unit (20) to a driven body (12d). Permanent magnets are arranged on the driven body (12d) so that different poles appear alternately on the outer periphery of the driven body (12d) when the driven body (12d) is rotated. The drive unit (20) is provided with: a magnet body (23) having permanent magnets arranged thereon so that different poles appear alternately on the outer periphery of the magnet body (23) when the magnet body (23) is rotated about a predetermined axis; and a rotary actuator (22) for rotating the magnet body (23) about the axis thereof. The magnet body (23) is disposed next to the driven body (12d) in such a manner that the axis of the magnet body (23) is oriented so as not to be perpendicular to the center of rotation of the impeller (12b). The impeller (12b) is rotated through the driven body (12d) by rotating the magnetic body (23) by means of the rotary actuator (22).</p>
